In this example, we are going to apply a CNN to classify dogs vs. cats images. This will walk you through the fundamentals of importing images, applying image augmentation, and performing classification on them.

Learning objectives:

  • What image generators are, why and how to use them.
  • What image augmentation is, why and how to use them.

Required packages

library(keras)
library(glue)
library(tidyverse)
Registered S3 methods overwritten by 'dbplyr':
  method         from
  print.tbl_lazy     
  print.tbl_sql      
── Attaching packages ─────────────────────────────────────────────────────── tidyverse 1.3.1 ──
✓ ggplot2 3.3.5     ✓ purrr   0.3.4
✓ tibble  3.1.5     ✓ dplyr   1.0.7
✓ tidyr   1.1.4     ✓ stringr 1.4.0
✓ readr   2.0.2     ✓ forcats 0.5.1
── Conflicts ────────────────────────────────────────────────────────── tidyverse_conflicts() ──
x dplyr::collapse() masks glue::collapse()
x dplyr::filter()   masks stats::filter()
x dplyr::lag()      masks stats::lag()

Data Preparation

Image location

We are going to use the Dogs vs. Cats Kaggle competition data set (https://www.kaggle.com/c/dogs-vs-cats/data). However, do to size and runtime limitations, we are going to only use a subset of the data. We have already set up the directories which look like:

paste0(data_directory,"dogs-vs-cats.zip")
[1] "/Users/milou/Documents/misk_projects/misk-dl/materials/datadogs-vs-cats.zip"
- data
   └── dogs-vs-cats
       └── train
           └── cats
               ├── cat.1.jpg
               ├── cat.2.jpg
               └── ...
           └── dogs
               ├── dog.1.jpg
               ├── dog.2.jpg
               └── ...
       └── validation
           ├── cats
           └── dogs
       └── test
           ├── cats
           └── dogs
# define the directories:
image_dir <- here::here("materials", "data", "dogs-vs-cats")

train_dir <- file.path(image_dir, "train")
valid_dir <- file.path(image_dir, "validation")
test_dir <- file.path(image_dir, "test")

# create train, validation, and test file paths for cat images
train_cats_dir <- file.path(train_dir, "cats")
valid_cats_dir <- file.path(valid_dir, "cats")
test_cats_dir <- file.path(test_dir, "cats")

# create train, validation, and test file paths for dog images
train_dogs_dir <- file.path(train_dir, "dogs")
valid_dogs_dir <- file.path(valid_dir, "dogs")
test_dogs_dir <- file.path(test_dir, "dogs")

Data set

Although there are 25,000 images in this data set, we are going to use a very small subset, which includes:

glue("Cat images:",
     " - total training cat images: {length(list.files(train_cats_dir))}",
     " - total validation cat images: {length(list.files(valid_cats_dir))}",
     " - total test cat images: {length(list.files(test_cats_dir))}",
     "\n",
     "Dog images:",
     " - total training dog images: {length(list.files(train_dogs_dir))}",
     " - total validation dog images: {length(list.files(valid_dogs_dir))}",
     " - total test dog images: {length(list.files(test_dogs_dir))}",
     .sep = "\n"
     )
Cat images:
 - total training cat images: 0
 - total validation cat images: 0
 - total test cat images: 0


Dog images:
 - total training dog images: 0
 - total validation dog images: 0
 - total test dog images: 0
glue("Cat images:",
     " - total training cat images: {length(list.files(train_cats_dir))}",
     " - total validation cat images: {length(list.files(valid_cats_dir))}",
     " - total test cat images: {length(list.files(test_cats_dir))}",
     "\n",
     "Dog images:",
     " - total training dog images: {length(list.files(train_dogs_dir))}",
     " - total validation dog images: {length(list.files(valid_dogs_dir))}",
     " - total test dog images: {length(list.files(test_dogs_dir))}",
     .sep = "\n"
     )
Cat images:
 - total training cat images: 1000
 - total validation cat images: 500
 - total test cat images: 500


Dog images:
 - total training dog images: 1000
 - total validation dog images: 500
 - total test dog images: 500

Let’s check out the first 10 cat and dog images:

op <- par(mfrow = c(4, 5), pty = "s", mar = c(0.1, 0.1, 0.1, 0.1))
for (i in 1:10) {
  plot(as.raster(jpeg::readJPEG(paste0(train_cats_dir, "/cat.", i, ".jpg"))))
  plot(as.raster(jpeg::readJPEG(paste0(train_dogs_dir, "/dog.", i, ".jpg"))))
}
par(op)

CNN with image generator

Define and compile model

We’re going to set up a simple CNN model that contains steps you saw in the previous module. This CNN includes:

  • Four sequential conv and max pooling layers
  • Flatten layer
  • Densly-connected network
  • Single binary output
model <- keras_model_sequential() %>%
  
  # feature detector portion of model
  layer_conv_2d(filters = 32, kernel_size = c(3, 3), activation = "relu", 
                input_shape = c(150, 150, 3)) %>%
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 64, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  # classifier portion of model
  layer_flatten() %>%
  layer_dense(units = 512, activation = "relu") %>%
  layer_dense(units = 1, activation = "sigmoid")

summary(model)
Model: "sequential_1"
_____________________________________________________________________________________________________________________________
Layer (type)                                            Output Shape                                      Param #            
=============================================================================================================================
conv2d_6 (Conv2D)                                       (None, 148, 148, 32)                              896                
_____________________________________________________________________________________________________________________________
max_pooling2d_5 (MaxPooling2D)                          (None, 74, 74, 32)                                0                  
_____________________________________________________________________________________________________________________________
conv2d_5 (Conv2D)                                       (None, 72, 72, 64)                                18496              
_____________________________________________________________________________________________________________________________
max_pooling2d_4 (MaxPooling2D)                          (None, 36, 36, 64)                                0                  
_____________________________________________________________________________________________________________________________
conv2d_4 (Conv2D)                                       (None, 34, 34, 128)                               73856              
_____________________________________________________________________________________________________________________________
max_pooling2d_3 (MaxPooling2D)                          (None, 17, 17, 128)                               0                  
_____________________________________________________________________________________________________________________________
conv2d_3 (Conv2D)                                       (None, 15, 15, 128)                               147584             
_____________________________________________________________________________________________________________________________
max_pooling2d_2 (MaxPooling2D)                          (None, 7, 7, 128)                                 0                  
_____________________________________________________________________________________________________________________________
flatten_1 (Flatten)                                     (None, 6272)                                      0                  
_____________________________________________________________________________________________________________________________
dense_3 (Dense)                                         (None, 512)                                       3211776            
_____________________________________________________________________________________________________________________________
dense_2 (Dense)                                         (None, 1)                                         513                
=============================================================================================================================
Total params: 3,453,121
Trainable params: 3,453,121
Non-trainable params: 0
_____________________________________________________________________________________________________________________________

Compile the model:

model %>% compile(
  loss = "binary_crossentropy",
  optimizer = optimizer_rmsprop(lr = 0.0001),
  metrics = "accuracy"
)

Read images from directories

Next, we need a process that imports our images and transforms them to tensors that our model can process. We’ll use two functions to perform this process.

image_data_generator will:

  1. Read the image files
  2. Decode the image to RGB grids of pixels
  3. Convert these into floating point tensors
  4. Rescale pixel values to [0, 1] interval

image_data_generator provides other capabilities that we’ll look at shortly.

flow_images_from_directory will:

  1. Apply image_data_generator
  2. To a batch of 20 images at a time
  3. From our training directory (randomly shuffling between subdirectories)
  4. Resize these images to be consistent size of 150x150 pixels
  5. Apply binary labels
train_datagen <- image_data_generator(rescale = 1/255)
valid_datagen <- image_data_generator(rescale = 1/255)

train_generator <- flow_images_from_directory(
  train_dir,
  train_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)
Found 2000 images belonging to 2 classes.
validation_generator <- flow_images_from_directory(
  valid_dir,
  valid_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)
Found 1000 images belonging to 2 classes.

If we get the first batch from the generator, you will see that it yields 20 images of 150x150 pixels with three channels (20, 150, 150, 3) along with their binary labels (0, 1).

batch <- generator_next(train_generator)
str(batch)
List of 2
 $ : num [1:20, 1:150, 1:150, 1:3] 0.8118 0.6667 0.0235 0.1647 0.2824 ...
 $ : num [1:20(1d)] 0 1 1 0 1 1 0 1 1 0 ...

Train the model

To train our model we’ll use fit_generator which is the equivalent of fit for data generators. We provide it our generators for the training and validation data. Plus, we need to specify:

  • steps_per_epoch: how many samples to draw from the training generator before declaring an epoch over. Our generator supplies batches of 20 and we have 2,000 training images so we need 100 steps.
  • validation_steps: how many samples to draw from the validation generator. Our generator supplies batches of 20 and we have 1,000 validation images so we need 50 steps.

Note:

  • Without a GPU this will take approximately 20 minutes to train
  • With GPUs this will take approximately 5 minutes
history <- model %>% fit_generator(
  train_generator,
  steps_per_epoch = 100,
  epochs = 30,
  validation_data = validation_generator,
  validation_steps = 50,
  callbacks = callback_early_stopping(patience = 5)
)
Epoch 1/30

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100/100 [==============================] - 39s 375ms/step - loss: 0.6877 - accuracy: 0.5390

100/100 [==============================] - 44s 425ms/step - loss: 0.6877 - accuracy: 0.5390 - val_loss: 0.6844 - val_accuracy: 0.5080
Epoch 2/30

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100/100 [==============================] - 37s 366ms/step - loss: 0.6541 - accuracy: 0.6090

100/100 [==============================] - 41s 410ms/step - loss: 0.6541 - accuracy: 0.6090 - val_loss: 0.6366 - val_accuracy: 0.6370
Epoch 3/30

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100/100 [==============================] - 31s 311ms/step - loss: 0.6150 - accuracy: 0.6565

100/100 [==============================] - 35s 353ms/step - loss: 0.6150 - accuracy: 0.6565 - val_loss: 0.6116 - val_accuracy: 0.6640
Epoch 4/30

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100/100 [==============================] - 32s 325ms/step - loss: 0.5731 - accuracy: 0.6970

100/100 [==============================] - 37s 366ms/step - loss: 0.5731 - accuracy: 0.6970 - val_loss: 0.5952 - val_accuracy: 0.6680
Epoch 5/30

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100/100 [==============================] - 32s 319ms/step - loss: 0.5386 - accuracy: 0.7290

100/100 [==============================] - 36s 362ms/step - loss: 0.5386 - accuracy: 0.7290 - val_loss: 0.7160 - val_accuracy: 0.6090
Epoch 6/30

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100/100 [==============================] - 32s 319ms/step - loss: 0.5110 - accuracy: 0.7555

100/100 [==============================] - 36s 362ms/step - loss: 0.5110 - accuracy: 0.7555 - val_loss: 0.5651 - val_accuracy: 0.7000
Epoch 7/30

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100/100 [==============================] - 32s 317ms/step - loss: 0.4869 - accuracy: 0.7795

100/100 [==============================] - 36s 359ms/step - loss: 0.4869 - accuracy: 0.7795 - val_loss: 0.5566 - val_accuracy: 0.7050
Epoch 8/30

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100/100 [==============================] - 32s 316ms/step - loss: 0.4679 - accuracy: 0.7790

100/100 [==============================] - 36s 358ms/step - loss: 0.4679 - accuracy: 0.7790 - val_loss: 0.5756 - val_accuracy: 0.7050
Epoch 9/30

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100/100 [==============================] - 33s 326ms/step - loss: 0.4392 - accuracy: 0.7940

100/100 [==============================] - 36s 366ms/step - loss: 0.4392 - accuracy: 0.7940 - val_loss: 0.5820 - val_accuracy: 0.7080
Epoch 10/30

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100/100 [==============================] - 32s 319ms/step - loss: 0.4204 - accuracy: 0.8065

100/100 [==============================] - 36s 363ms/step - loss: 0.4204 - accuracy: 0.8065 - val_loss: 0.6259 - val_accuracy: 0.6850
Epoch 11/30

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100/100 [==============================] - 33s 328ms/step - loss: 0.3982 - accuracy: 0.8275

100/100 [==============================] - 37s 371ms/step - loss: 0.3982 - accuracy: 0.8275 - val_loss: 0.6418 - val_accuracy: 0.6890
Epoch 12/30

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 97/100 [============================>.] - ETA: 1s - loss: 0.3654 - accuracy: 0.8485
 98/100 [============================>.] - ETA: 0s - loss: 0.3650 - accuracy: 0.8485
 99/100 [============================>.] - ETA: 0s - loss: 0.3655 - accuracy: 0.8485
100/100 [==============================] - 37s 367ms/step - loss: 0.3650 - accuracy: 0.8485

100/100 [==============================] - 43s 435ms/step - loss: 0.3650 - accuracy: 0.8485 - val_loss: 0.5721 - val_accuracy: 0.7180

Our first model’s performance is not that bad but definitely has room for improvement.

best_epoch <- which.min(history$metrics$val_loss)
best_loss <- history$metrics$val_loss[best_epoch] %>% round(3)
best_acc <- history$metrics$val_accuracy[best_epoch] %>% round(3)

glue("Our optimal loss is {best_loss} with an accuracy of {best_acc}")
Our optimal loss is 0.557 with an accuracy of 0.705
plot(history) + 
  scale_x_continuous(limits = c(0, length(history$metrics$val_loss)))
Scale for 'x' is already present. Adding another scale for 'x', which will replace the existing scale.
`geom_smooth()` using formula 'y ~ x'

CNN with Image Augmentation

Image Augmentation

Our model above does ok but definitely has room for improvement. One approach to improve performance is to collect more data. Unfortunately, this is not always an option. An alternative is to use image augmentation. ℹ️

datagen <- image_data_generator(
  rescale = 1/255,
  rotation_range = 40,
  width_shift_range = 0.2,
  height_shift_range = 0.2,
  shear_range = 0.2,
  zoom_range = 0.2,
  horizontal_flip = TRUE,
  fill_mode = "nearest"
)

The following helps to visualize the idea of image augmentation by:

  • Reading in the first image and resizing it to 150x150,
  • Converting it to an array with shape (150, 150, 3),
  • Reshaping it to (1, 150, 150, 3),
  • Generating batches of randomly transformed images.
# get the first cat image
fnames <- list.files(train_cats_dir, full.names = TRUE)
img_path <- fnames[[1]]

# resize & reshape
img <- image_load(img_path, target_size = c(150, 150))
img_array <- image_to_array(img)
img_array <- array_reshape(img_array, c(1, 150, 150, 3))

# generate a a single augmented image
augmentation_generator <- flow_images_from_data(
  img_array,
  generator = datagen,
  batch_size = 1
)

# plot 10 augmented images of the first cat image
op <- par(mfrow = c(2, 5), pty = "s", mar = c(0, 0.1, 0, 0.1))
for (i in 1:10) {
  batch <- generator_next(augmentation_generator)
  plot(as.raster(batch[1,,,]))
}
par(op)

Build & train model

Let’s create a new model that includes image augmentation and we’ll apply the dropout regularization method. The following creates a CNN architecture with:

  • Four sequential conv and max pooling layers
  • Flatten layer
  • Dropout layer
  • Densly-connected network

All of which you are familiary with by now.

model <- keras_model_sequential() %>%
  layer_conv_2d(filters = 32, kernel_size = c(3, 3), activation = "relu", 
                input_shape = c(150, 150, 3)) %>%
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 64, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_flatten() %>%
  layer_dropout(rate = 0.5) %>%
  layer_dense(units = 512, activation = "relu") %>%
  layer_dense(units = 1, activation = "sigmoid")

model %>% compile(
  loss = "binary_crossentropy",
  optimizer = optimizer_rmsprop(lr = 0.0001),
  metrics = "accuracy"
)

Now we can add image augmentation to our image_data_generator(). The rest of the inputs remain the same.

Note:

  • Without a GPU this will take approximately 60 minutes to train
  • With GPUs this will take approximately 20-30 minutes
# only augment training data
train_datagen <- image_data_generator(
  rescale = 1/255,
  rotation_range = 40,
  width_shift_range = 0.2,
  height_shift_range = 0.2,
  shear_range = 0.2,
  zoom_range = 0.2,
  horizontal_flip = TRUE,
)

# do not augment test and validation data
test_datagen <- image_data_generator(rescale = 1/255)

# generate batches of data from training directory
train_generator <- flow_images_from_directory(
  train_dir,
  train_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)

# generate batches of data from validation directory
validation_generator <- flow_images_from_directory(
  valid_dir,
  test_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)

# train model
history <- model %>%
  fit_generator(
    train_generator,
    steps_per_epoch = 100,
    epochs = 100,
    validation_data = validation_generator,
    validation_steps = 50,
    callbacks = callback_early_stopping(patience = 10)
  )

As you can see, using image augmentation helps to improve our model’s performance. In fact, if we had more patience with our early stopping we may even be able to nudge out a little more loss reduction.

best_epoch <- which.min(history$metrics$val_loss)
best_loss <- history$metrics$val_loss[best_epoch] %>% round(3)
best_acc <- history$metrics$val_accuracy[best_epoch] %>% round(3)

glue("Our optimal loss is {best_loss} with an accuracy of {best_acc}")
plot(history) + 
  scale_x_continuous(limits = c(0, length(history$metrics$val_loss)))

Save the model

We can always save our models as h5 files. Let’s save this model as we will use it one of the “extras” notebooks to illustrate how we can visualize CNNs (see this notebook https://misk-data-science.github.io/misk-dl/notebooks/99x6-visualizing-what-cnns-learn.nb.html).

model %>% save_model_hdf5("cats_and_dogs_small_1.h5")

However, we still have room for improvement because we are only using a small subset of the available data. We have two options to improve our model:

  1. Use more data. We are only using 2,000 of the 25,000 available images. However, this would have a significant impact on compute time.

  2. Use transfer learning. This is much quicker than the first option so in the next module I demonstrate how to use transfer learning for CNNs.

Takeways

  • When using image data we…
    • use image_data_generator to read the images, decode pixel values, convert to a tensor, rescale, and perform image augmentation.
    • use flow_images_from_directory import batches of our images, apply the image_data_generator, resize, and infer training labels.
  • Image augmentation such as zooming, flipping, rotating, shearing, etc. helps with image variance, provides free additional data, and generally improves model performance.

🏠

---
title: "Computer vision & CNNs: Cats vs. Dogs"
output:
  html_notebook:
    toc: yes
    toc_float: true
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, message = FALSE, warning = FALSE)
ggplot2::theme_set(ggplot2::theme_bw())
```

In this example, we are going to apply a CNN to classify dogs vs. cats images. 
This will walk you through the fundamentals of importing images, applying image 
augmentation, and performing classification on them.

Learning objectives:

- What image generators are, why and how to use them.
- What image augmentation is, why and how to use them.

# Required packages

```{r}
library(keras)
library(glue)
library(tidyverse)
```

# Data Preparation

## Image location

We are going to use the Dogs vs. Cats Kaggle competition data set
(https://www.kaggle.com/c/dogs-vs-cats/data). However, do to size and runtime 
limitations, we are going to only use a subset of the data.  We have already 
set up the directories which look like:


```{r}
data_directory <- here::here("materials", "data")

if (!dir.exists(data_directory)) {
 dir.create(data_directory)
}

dogs_cats <- file.path(data_directory, "dogs-vs-cats")

if (!dir.exists(dogs_cats)) {
 # create main directory for images
 dir.create(dogs_cats)
 all_images <- file.path(dogs_cats, "full")
 dir.create(all_images)
 
 # download & extract images
 system("kaggle competitions download -c dogs-vs-cats")
 fs::file_move(paste0(data_directory,"/dogs-vs-cats.zip"), dogs_cats)
 # getwd()
 for (zip_file in c("train.zip", "test1.zip")) {
  
  unzip(file.path(dogs_cats, "dogs-vs-cats.zip"), 
        files = zip_file,
        exdir = all_images)
  
  unzip(file.path(all_images, zip_file), exdir = all_images)
  file.remove(file.path(all_images, zip_file))
 }
 
 # create new subdirectories that contain only a fraction of the entire dataset
 new_directories <- expand.grid(
  directory = c("train", "validation", "test"),
  animal = c("cats", "dogs"),
  stringsAsFactors = FALSE
 )
 
 for (ob in 1:nrow(new_directories)) {
  # create new directories to store subset of images
  directory <- new_directories[ob, "directory"]
  animal <- new_directories[ob, "animal"]
  top_dir <- file.path(dogs_cats, directory)
  sub_dir <- file.path(dogs_cats, directory, animal)
  if (!dir.exists(top_dir)) dir.create(top_dir)
  dir.create(sub_dir)
  
  # create image file names and copy to new location
  img_tag <- switch(animal,
                    cats = "cat.",
                    dogs = "dog."
  )
  quantity <- switch(directory,
                     train = 1:1000,
                     validation = 1001:1500,
                     test = 1501:2000)
  fnames <- paste0(img_tag, quantity, ".jpg")
  invisible(
   file.copy(from = file.path(all_images, "train", fnames), to = sub_dir)
  )
 }
 
 # clean up
 invisible(file.remove(file.path(dogs_cats, "dogs-vs-cats.zip")))
}
```


```
- data
   └── dogs-vs-cats
       └── train
           └── cats
               ├── cat.1.jpg
               ├── cat.2.jpg
               └── ...
           └── dogs
               ├── dog.1.jpg
               ├── dog.2.jpg
               └── ...
       └── validation
           ├── cats
           └── dogs
       └── test
           ├── cats
           └── dogs
```

```{r image-file-paths}
# define the directories:
image_dir <- here::here("materials", "data", "dogs-vs-cats")

train_dir <- file.path(image_dir, "train")
valid_dir <- file.path(image_dir, "validation")
test_dir <- file.path(image_dir, "test")

# create train, validation, and test file paths for cat images
train_cats_dir <- file.path(train_dir, "cats")
valid_cats_dir <- file.path(valid_dir, "cats")
test_cats_dir <- file.path(test_dir, "cats")

# create train, validation, and test file paths for dog images
train_dogs_dir <- file.path(train_dir, "dogs")
valid_dogs_dir <- file.path(valid_dir, "dogs")
test_dogs_dir <- file.path(test_dir, "dogs")
```

## Data set

Although there are 25,000 images in this data set, we are going to use a very 
small subset, which includes:

```{r verify-data}
glue("Cat images:",
     " - total training cat images: {length(list.files(train_cats_dir))}",
     " - total validation cat images: {length(list.files(valid_cats_dir))}",
     " - total test cat images: {length(list.files(test_cats_dir))}",
     "\n",
     "Dog images:",
     " - total training dog images: {length(list.files(train_dogs_dir))}",
     " - total validation dog images: {length(list.files(valid_dogs_dir))}",
     " - total test dog images: {length(list.files(test_dogs_dir))}",
     .sep = "\n"
     )
```

Let's check out the first 10 cat and dog images:

```{r example-images}
op <- par(mfrow = c(4, 5), pty = "s", mar = c(0.1, 0.1, 0.1, 0.1))
for (i in 1:10) {
  plot(as.raster(jpeg::readJPEG(paste0(train_cats_dir, "/cat.", i, ".jpg"))))
  plot(as.raster(jpeg::readJPEG(paste0(train_dogs_dir, "/dog.", i, ".jpg"))))
}
par(op)
```

# CNN with image generator

## Define and compile model

We're going to set up a simple CNN model that contains steps you saw in the 
previous module. This CNN includes:

- Four sequential conv and max pooling layers
- Flatten layer
- Densly-connected network
- Single binary output

```{r cnn-architecture}
model <- keras_model_sequential() %>%
  
  # feature detector portion of model
  layer_conv_2d(filters = 32, kernel_size = c(3, 3), activation = "relu", 
                input_shape = c(150, 150, 3)) %>%
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 64, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  
  # classifier portion of model
  layer_flatten() %>%
  layer_dense(units = 512, activation = "relu") %>%
  layer_dense(units = 1, activation = "sigmoid")

summary(model)
```

Compile the model:

```{r cnn-compile}
model %>% compile(
  loss = "binary_crossentropy",
  optimizer = optimizer_rmsprop(lr = 0.0001),
  metrics = "accuracy"
)
```

## Read images from directories

Next, we need a process that imports our images and transforms them to tensors
that our model can process. We'll use two functions to perform this process.

`image_data_generator` will:

1. Read the image files
2. Decode the image to RGB grids of pixels
3. Convert these into floating point tensors
4. Rescale pixel values to [0, 1] interval

`image_data_generator` provides other capabilities that we'll look at shortly.

`flow_images_from_directory` will:

1. Apply `image_data_generator`
2. To a batch of 20 images at a time
3. From our training directory (randomly shuffling between subdirectories)
4. Resize these images to be consistent size of 150x150 pixels
5. Apply binary labels

```{r cnn-image-generator}
train_datagen <- image_data_generator(rescale = 1/255)
valid_datagen <- image_data_generator(rescale = 1/255)

train_generator <- flow_images_from_directory(
  train_dir,
  train_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)

validation_generator <- flow_images_from_directory(
  valid_dir,
  valid_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)
```

If we get the first batch from the generator, you will see that it yields 20 
images of 150x150 pixels with three channels (20, 150, 150, 3) along with their 
binary labels (0, 1).

```{r generator-structure}
batch <- generator_next(train_generator)
str(batch)
```

## Train the model

To train our model we'll use `fit_generator` which is the equivalent of `fit` 
for data generators.  We provide it our generators for the training and 
validation data.  Plus, we need to specify:

- `steps_per_epoch`: how many samples to draw from the training generator before 
  declaring an epoch over. Our generator supplies batches of 20 and we have 
  2,000 training images so we need 100 steps.
- `validation_steps`: how many samples to draw from the validation generator. 
  Our generator supplies batches of 20 and we have 1,000 validation images so we
  need 50 steps.
  
__Note__:

* Without a GPU this will take approximately 20 minutes to train
* With GPUs this will take approximately 5 minutes

```{r cnn-train}
history <- model %>% fit_generator(
  train_generator,
  steps_per_epoch = 100,
  epochs = 30,
  validation_data = validation_generator,
  validation_steps = 50,
  callbacks = callback_early_stopping(patience = 5)
)
```

Our first model's performance is not that bad but definitely has room for
improvement.

```{r initial-model-results}
best_epoch <- which.min(history$metrics$val_loss)
best_loss <- history$metrics$val_loss[best_epoch] %>% round(3)
best_acc <- history$metrics$val_accuracy[best_epoch] %>% round(3)

glue("Our optimal loss is {best_loss} with an accuracy of {best_acc}")
```


```{r plot-history}
plot(history) + 
  scale_x_continuous(limits = c(0, length(history$metrics$val_loss)))
```


# CNN with Image Augmentation

## Image Augmentation

Our model above does ok but definitely has room for improvement. One approach 
to improve performance is to collect more data. Unfortunately, this is not always 
an option. An alternative is to use ___image augmentation___. [ℹ️](https://misk-data-science.github.io/misk-dl/02-computer-vision.html#38)

```{r image-augmentation}
datagen <- image_data_generator(
  rescale = 1/255,
  rotation_range = 40,
  width_shift_range = 0.2,
  height_shift_range = 0.2,
  shear_range = 0.2,
  zoom_range = 0.2,
  horizontal_flip = TRUE,
  fill_mode = "nearest"
)
```

The following helps to visualize the idea of image augmentation by:

- Reading in the first image and resizing it to 150x150,
- Converting it to an array with shape (150, 150, 3),
- Reshaping it to (1, 150, 150, 3),
- Generating batches of randomly transformed images.

```{r view-augmented-images}
# get the first cat image
fnames <- list.files(train_cats_dir, full.names = TRUE)
img_path <- fnames[[1]]

# resize & reshape
img <- image_load(img_path, target_size = c(150, 150))
img_array <- image_to_array(img)
img_array <- array_reshape(img_array, c(1, 150, 150, 3))

# generate a a single augmented image
augmentation_generator <- flow_images_from_data(
  img_array,
  generator = datagen,
  batch_size = 1
)

# plot 10 augmented images of the first cat image
op <- par(mfrow = c(2, 5), pty = "s", mar = c(0, 0.1, 0, 0.1))
for (i in 1:10) {
  batch <- generator_next(augmentation_generator)
  plot(as.raster(batch[1,,,]))
}
par(op)
```

## Build & train model

Let's create a new model that includes image augmentation and we'll apply the 
dropout regularization method. The following creates a CNN architecture with:

- Four sequential conv and max pooling layers
- Flatten layer
- Dropout layer
- Densly-connected network

All of which you are familiary with by now.

```{r cnn-structure2}
model <- keras_model_sequential() %>%
  layer_conv_2d(filters = 32, kernel_size = c(3, 3), activation = "relu", 
                input_shape = c(150, 150, 3)) %>%
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 64, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_conv_2d(filters = 128, kernel_size = c(3, 3), activation = "relu") %>% 
  layer_max_pooling_2d(pool_size = c(2, 2)) %>%
  layer_flatten() %>%
  layer_dropout(rate = 0.5) %>%
  layer_dense(units = 512, activation = "relu") %>%
  layer_dense(units = 1, activation = "sigmoid")

model %>% compile(
  loss = "binary_crossentropy",
  optimizer = optimizer_rmsprop(lr = 0.0001),
  metrics = "accuracy"
)
```

Now we can add image augmentation to our `image_data_generator()`. The rest of 
the inputs remain the same.

__Note__:

* Without a GPU this will take approximately 60 minutes to train
* With GPUs this will take approximately 20-30 minutes

```{r augment-and-train}
# only augment training data
train_datagen <- image_data_generator(
  rescale = 1/255,
  rotation_range = 40,
  width_shift_range = 0.2,
  height_shift_range = 0.2,
  shear_range = 0.2,
  zoom_range = 0.2,
  horizontal_flip = TRUE,
)

# do not augment test and validation data
test_datagen <- image_data_generator(rescale = 1/255)

# generate batches of data from training directory
train_generator <- flow_images_from_directory(
  train_dir,
  train_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)

# generate batches of data from validation directory
validation_generator <- flow_images_from_directory(
  valid_dir,
  test_datagen,
  target_size = c(150, 150),
  batch_size = 20,
  class_mode = "binary"
)

# train model
history <- model %>%
  fit_generator(
    train_generator,
    steps_per_epoch = 100,
    epochs = 100,
    validation_data = validation_generator,
    validation_steps = 50,
    callbacks = callback_early_stopping(patience = 10)
  )
```

As you can see, using image augmentation helps to improve our model's
performance. In fact, if we had more `patience` with our early stopping we may
even be able to nudge out a little more loss reduction.

```{r second-model-results}
best_epoch <- which.min(history$metrics$val_loss)
best_loss <- history$metrics$val_loss[best_epoch] %>% round(3)
best_acc <- history$metrics$val_accuracy[best_epoch] %>% round(3)

glue("Our optimal loss is {best_loss} with an accuracy of {best_acc}")
```


```{r second-model-plot}
plot(history) + 
  scale_x_continuous(limits = c(0, length(history$metrics$val_loss)))
```

## Save the model

We can always save our models as h5 files. Let's save this model as we will use
it one of the "extras" notebooks to illustrate how we can visualize CNNs (see
this notebook https://misk-data-science.github.io/misk-dl/notebooks/99x6-visualizing-what-cnns-learn.nb.html).

```{r save-model}
model %>% save_model_hdf5("cats_and_dogs_small_1.h5")
```

However, we still have room for improvement because we are only using a small
subset of the available data. We have two options to improve our model:

1. Use more data. We are only using 2,000 of the 25,000 available images.
   However, this would have a significant impact on compute time.
   
2. Use transfer learning. This is much quicker than the first option so in the
   next module I demonstrate how to use transfer learning for CNNs.

# Takeways

* When using image data we...
   - use `image_data_generator` to read the images, decode pixel values, convert
     to a tensor, rescale, and perform image augmentation.
   - use `flow_images_from_directory` import batches of our images, apply the
     `image_data_generator`, resize, and infer training labels.
     
* Image augmentation such as zooming, flipping, rotating, shearing, etc. helps
  with image variance, provides free additional data, and generally improves
  model performance.
  
[🏠](https://github.com/misk-data-science/misk-dl)
